Question

If `C(x)=2x-4`, what is `C(2)`?

Answer 1

`C(2)=4-4=0`

Explanation:

When working with this type of problem, with a formula such as:

`C(x)=2x-4`

and we're also told `C(2)`, it's saying that `x=2` and that everywhere we see an `x`, we should put in 2 instead:

`C(2)=2(2)-4`

and now we solve:

`C(2)=4-4=0`